Rack-cutting machine.



W. P. ZIMMERMANN. RACK GUTTI NG MACHINE. APPLICATION FILED OUT. 6, 1908. 7 1,033,144. Patented July 23, 912.

7 SHEETS-SHEET W. F. ZIMMERMANN.

RACK CUTTING MACHINE.

APPLICATION FILED OCT. 6, 1908.

Patented Ju1 '23, 1912.-

7 SHEETS-SHEET 2.

W/f/VESSfS W. F. ZIMMERMANN. RACK CUTTING MACHINE.

MPILIOATION FILED OCT 6, 1908.-

1,033,144.. Patented July 23,1912.

7 SHEETS-SHEET a.

mr/vzssas: wa /rm? -MM W W, F; ZIM-MERMANN. RAGK GUTTINGMAGHINE. APPLICATION FILED OUT 6, L903.

Patented July 23, 191 2.

7 SHEETS-SHEET {1.

WIT/10.3555.

W.- F. ZIMMERMANN. RACK 011mm MACHINE.

APPLICATION FILED OCT. 6, 1908. I 1,033,144, Patented July 23,1912.

7 SHEETS-SHEET 5 w o max 5555:

W. F. ZIMMER-MANN.

RAGK CUTTING MACHINE. APPLICATION IIL'ED 001 a, 1 908.

' Patented July 23, 1912.

7 sHBBTs-sHEBT' 6.

W. F. ZIMMERMANN.

RAGKOUTTING MACHINE.

APPLICATION FILED OCT 6, 1908.

1,033,144. 4 Patented Ji11y'23,1912.

WITNESSES; Mk/Wok WM 54% W v w UNITED STATES PATENT o FIoE. E v

WILLIAM F. ZIMMERMANN, or NEWARK, NEW JERsEY, ASSIGNOR TO GOULD & EBE RQ HARD'I, or NE ARK, NEW JERSEY, A CORPORATION or NEW JERsEY.

RACK-CUTTING MACHINE.

Specification of Letters 1atent.

Patented July 23,1912.

Application filed'octoher 6, 1908. Serial No. 456,388.

To all whom it may concern:

Be it known that I, WILLIAM F. ZIMMER- MANN, a citizen of the United States, residing at Newark, in the county of Essex and State of. New Jersey, have invented cer-- novel feed changingdevice to rapidly and conveniently change the feeds of the cutter. For this particular feature a separate application has been filed June 7, 1907, Serial No. 377,711.

Another featureis the indexing mecha-V nism, by means of which it is possible to obtain very accurate spacing of the teeth for any number of cutters within the range of the machine. For this feature there has been a patent granted January 5, 1909, No.

909,126. A further novel feature relates to an arrangement to, readily cut diametral, circular, module or millimeter pitches with only one pitch index screw. It has heretofore been the practice toprovide two or more screws to cut the above recited pitches. I

Other features relate to the novel arrangement of lovers, whereby every motion of the machine is automatically controlled and interlocked, and which also provide for an au tomatic stop whereby the feeding of the cutter and the indexing can be automatically disconnected at any predetermined point upon the rack.

The various features of this inventlon Wlll he best understood from the detailed description thereof,reference'being had to the acimmpanyi11g drawings which illustrate the c ihodiinent of the above said features in their preferred form, and more particularlypointed out in the claims herewith append-ed.

In the drawings Figure 1 is a plan View of the invention with portion of the framing broken away to more clearly illustrate the cutter feed and return mechanism, Fig. 2 a rear end elevation, showing a section therewith.

through X X ofFig. 1, Fig. 3 is a side elevation illustrating the cutter driving mechanism, withthecasing broken-away in places to readily show the interior, this view also shows the indexing change gears Fig. 4 is a partial side elevation of the cutter feed rangement for controlling the various functrons of the machine; Fig. 5 is a sectional view of the indexing mechanism at Z, Z, Z

and Z of Fig. 6, the latter being an end sectional View of Fig. 5 at Y, Y, Y? and and return mechanism, and the lever ar- Y Fig. '7 is an isometric view of the indexing latch; and Figs. 8 to 13, inclusive,-show v the arrangement to cut diametral, circular, module and millimeter pitches with one index screw'; Fig. 16 is a side elevation of the. lever arrangement, and Figs. 14 and 15 are plan views of the same ;"'Figs. 17 and 18 are end elevations of the levers, and Fig. 19 is a section at a a of Fig. 16. I

Referring especially to Figs. 1, 2 and 3,

the frame 1 is of T-shaped construction with astanchion or upright Q-adjustably mounted upon the stem end of same. The said stanchion 2 is adjusted toward or away from the work table 63 by means of a graduated handwheel- 173 which is secured to the adjusting screwl74ethat engages a threaded portion 175 in the stanchion 2. The stanchion 2 has vertical guideways facing the long end of the frame 1, upon which the cutter carriage 3 is mounted, to reciprocate; the cutter carriage 3 1s provided with a cutter spindle #l rotatably mounted .therein, to which the cutters 5 are secured to rotate The cutter spindle ethas secured thereon two helical gears with their helices .in opposite directions to equalize the strains.

the left hand helical gear 6 is attached close to the cutters 5, and is preferably in one piece with the spindle 4, the right hand gear 7 is keyed to outer end of the spindle 4: and

. is driven by the helical gear 8 which is secured to the shaft The shaft 911% secured to its other end the helical gear 10 which drives the left hand helical gear 6. The arrangement of helical gears eliminates the objectionable .end thrust characteristic of helical gears when arranged in parallel drives, andalso provides a powerful cutter drive,. which has always been a difiicult problem to'solve in rack cuttingnnachines, due to the fact that the diameter of the cutter spindle gears are limited to the diameter 1 of the cutter litinus twice the depth of the cured to the stanchion 2.

space to be cut. The shaft- 9 has also keyed thereto the worm wheel 11-WlliCl1\lS driven by the worm l2'splined to the vertical shaft 13, thus giving motion to the shaft 5) and then to the cutter spindle t through the helical gears.

The worm 12 is keyed to the vertical shaft 13 to rotate therewith and allow of avertical adjustment thereon. The splined shaft l3 is arranged in a bearing in the stanchion cap it at its uppeizend, and in the braukct to at the lower end. Upon the lower end of said shaft'l3 is secured a bevel gear 16 driven by the sleeve bevel gear 17; both gears are carried by the bracket 15 se- 1 The sleeve bevel gear 17 is slidably keyed to the horizontal cutter drive shaft 18 and rotates therewith. The hm-izontal shaft 18 is splined and has a bearing at one end in the main frame 1, and the other end is supported by the-bevel gear bracket 15), and has keyed thereto a changev gear 20 which is engaged with a second change gear 21 keyed to the horizontal shaft The change gears 20 and :21 are. used to vary the rotations of the cutters. The horizontal shaft 22 has secured thereto a bevel gear 23 driven by the evel gear :24: secured to the main drivingsh 25, passing across the stent end of the main frame 1, and having secu red to its ot ier end the pulley 26, driving the entire me l anism.

Referring now to t. the cutter carriage is mountet ppon st italole guideways ofthe stanchion 2,. and is reciprocated by means of a screw 2 engaging with the nut 23 secured in the cutter carriage 3. The

screw 27 has a bearing at the upper end in thestanehion cap 14, and at the lower end is keyed a' bevel gear 29 driven by a sleeve bevel gear 30 slidably keyed upon the hori zc'ntal feed driving shaft 31 and carried by a bearing in the stanchion 2. The horizontal feed driving shaft'31 passes through the entire length of the stem end-of the main frame with bearings at each end. Loosely mounted on' one end ofsaid feed driving shaft 31 is the cutter feed and return mechanism consisting of the feed worm wheel "and return worm wheel 33 both rotatably mounted in suitable bearings of the main frame and arranged to rotate in opposite directions. The opposing faces of said worm wheels 32-and'33 are provided with clutch teeth 34 and respectively which are arranged to be alternately engaged by the reversing clutch member 36. The clutch 36 is slidably keyed to thefeed driving shaft 31 and rotates therewith in either direction when engaging either the feed or return worm wheels 32 or 33. j

The feed worm wheel 32 receives its motion from the main driving shaft 25 through the variable gear Box 37 to the feed worm vertical and shaft 38, which are preferably made in one piece, the said feed worm 38 engaging with the wheel 32.

The variable feed gear box 37 consists of a gear 39 secured to the main drivingshaft 95 and driving a second gear l0 keyed to the feed tumbler shaft t1. Upon said shaft all is splined a: feed tumbler pinion 4'2, arranged to rotate therewith and carried by the tumbler lever The tumbler pinion 42 engages with a tumbler intermediate gear *3, which is secured to a second intermediate gear 14. Both gears 43 and t1 are rotatably mounted in said tumbler lever 4-5 and arranged to rotate about the tumbler shaft t1 as a center; and can be laterally adjusted so as to'individually engage the intermediate series of diversely sized gears lb, 47 and 48 which are preferably in one piece and loosely mounted on the intermediate shaft 49- -Upon the feed worm shaft 38 is arranged a second series of diverscly sized gears '50, 51 and in an inverse relation to the intermediate series l6, 4? and lb, and

also preferably made in one piece.

The second, or driven series of diversely sized gears 50, 5l and 52 are slidably keyed to the feed worm shaft 38 and are laterally adjusted to engage with the intermediate series 46, 47 and 48 respectively, by means .of alever 53 arranged on the outside of the ,box 37 with its fulcrum at 54-, projecting through the box 37 and having attached to its inner end another lever engaging a circular groove 56 in said driven series of gears, 50, 51 and v The rotary and lateral adjustments of the tumbler gears 42, 43 and it-4 to individually engage each of the said gears l3 and H with each of the intermediate series t6. t7 and t8, are obtained by the tumbler lever l5, which is locked in each of its adjusted positions by the locking lever 57 hinged in the tumbler lever at 58. In the other end of the locking lever 57 is arranged a pin ('30 which engages the holes provided in the box 37 for the various positions, and is held in place by the spring 1 as is customary in many variable speed devices.

The return worm wheel 33 receives its motion directly from the main shaft 25 through the return worm 62 keyed thereto" and rotating therewith.

The operation. of the reversing clutch 36 will be hereinafter fully explained in connection with the motion controlling devices.

.The work table 63 upon which the racks to tened thereon. A trough G7 to receive th said index shaft- 81 motion at any desired overflow lubricantis also provided around the other edge." The indexing screw 64 has a hearing at one end in the bushing 68 which is located in the frame 1, and is ar ranged to be adjusted in the direct-ion of its length by means of the studs .69 and check nuts 70. Thescrew 64 has a collar secured onqeach side of the bushing 68 tojact as. abutments for adjusting the screw 64 with the bushing 68, thereby adjusting the table in a longitudinal direction. This adjustment is employed to reset racks that have been cut, fora recut, or toposition the work accurately to commence cut-ting at a predetermined point. The other end of the feed'iscrew 64 has a bearing in the frame proper, and, is rotated by means of change wheels. liereinafter more ,fully described. The indexing mechanism to move the table 63 and the work thereon, the proper distancefor spacing the teeth, is driven from the horizontal shaft 22 which receives its motion directly from the main driving shaft 25 through the bevel gears 23 and 24. Slidably keyed to one end of the hori-' Zontal shaft 22 is a clutch 72 arranged to engage the bevel gear 73, loosely mounted on said shaft 22 and rotating in the bracket 76 and driving a second bevel gear 74 secured to the index driving shaft 75 which also has a bearing in the bracket 76 and is journaled at the other end in the index casing 77; i

Referring to Figs. 5, 6 and 7, secured to the end of the index driving shaft 75 is a pinion 78 engaging the driven gear 79 loosely mounted on, and concentric with the clutch disk 80; the said clutch disk 80 is secured to the index shaft 81. The flange 82 is secured to the clutch disk 80 and retains the driven gear 79. Rotatably' mounted within said clutch disk 80, and at a distance from the center is a .latch 83, having a portion of its shank cut away at 84. equal in width to the driven gear 79, to allow the said drivengear 79 to revolve freelyupon the clutclrtlisk 80. The clutch disk 80 has a depression upon its face, the sidesof which form the abutn'ients 172 for the latch 83. The driven gear 79 has a series of concave recesses 85 to engage with the latch 83-). The clutch disk 80 held stationary by. means of the indexing lever 86 holding the latch 8 disengaged from the recesses 85 in the driven gear 79, and thereby holding the index shaft 81 statienaav. liy withdrawing the indexing lever 86. the latch 83 is released, and the spring 87 draws the latch 8 forward until it. strikes the forward abutment 172. This brings the cut away portion 84 of the latch 83 within the path of one of the recesses 85. and thus positively ouples the constantly rotating index driving shaft '75 with the index shaft 81 giving -tion more fullyi described.

secured thereto at having a different .means of a sliding cam piece 99,

spring 7 draws the change intervals. The'indexing lever 86 is secured to a rock shaft 88 passing through the frame 1 and connected at its other end to the mocontrolling mechanism hereinafter The indexing lever 86 is held in its-operative or inoperative position by a spring controlled plunger 89 operating in the spaces 90 provided in. the casing 77.

To control the number of rotations of the index shaft 81 or to time the uncoupling of said shaft 81 from the constantly rotating Shaft 75 a positive mechanism is shown, which consists of a change gear 91secured tothe end of the index shaft 81, andengaging with a second change gear 92 keyed-to thee-end of a shaft 93, which; projects to the inner side of the box 77. Upon theinner end of said shaft 93 is secured a gear '94 en-] gaging the gear 95,-which .is preferably'in looselymounted on the index shaft 81, or any other suitable stud. -'The gear 96 engages with the sleeve gear 97 loosely mounted upon the shaft 93, and said gear 97 has series of cams 98, each number of lobes. The cams 98 control the index lever 86, by sliding longitudinally in the lever 86, and adapted to engage with either of the cains 98, when it is desired to intermittently rotate the index shaft 81, or it does not engage with any of the cams 98 when continuousmotion of the index shaft 81 is desired. The operation of this portion of the mechanism 'is as follows: The'index driving shaft 75- is a constantly rotating shaft, receiving its motion from the pulley 26, a pinion 78 secured thereto and constantly driving the clutch gear 79. hen the lever 86 is "flhdrawn from the latch 83 the said latch '83 forward until it-strikes the forward abutment 172 in the clutch disk 80. The latch 83 thus enthe next approaching recess 85 in the driven gear 79 and positively couples the index shaft 81 with the index driving shaft 75. The change gear 91 receives its motion from the index shaft 81 and engages the 93 to which it is secured, and the gear 94' also secured to the shaft 93. The gear 94 one piece with the gear 96, both being as described, with gear thereby rotating the shaft transmits motion to the double gears 95 and 9t) loosely mounted on the index shaft 81, the ear 96 IOttlllll" the sleeve ear 97 to which L! b 7 the cams 98 are secured; both the cams 98 and sleeve gear 97 rotate loosely on the shaft 93.

Assuming the sliding cam pie'ce 99' in the path of the cam having four lobes, the structure as shown being with one, two and 'l'our-lobcd cams, and the 91. b5, 96 and 97 being as l is to 4, and the change gears 91 and :92 as 1 to l, the lever ratio of gearing of rotations will be four. By changing the clutch disk 80.

86 will be for, :(l into the path of the latch 33 just before the index shaft 31 completes its first rotation, thus making only'oue complete rotation of the shaft 81 for each time the lever 86 is rocked to release the latch 33. T he sliding cam piece 99 has the number of lobes marked thereon to indicate the proper position of same to engage any cam. By moving the cam piece 99 into the path of the cam having two lobes, and the change gears 91 and 92 remaining the same ratio, the index shaft 81 will make two rotations between the coupling and uncoupling of the hen the cam piece is in the path of the one-lobed cam, the number gears 91 and 92 to make a ratio equal to 1 to 2, the index shaft would make 2, 4 and 8 rotations respectively, andv a ratio of 1 to 3 would'give 3, 6' and 12, etc. The cams 03 must have lobes whose numbers are factors of the ratio of gearing 91, 92, 93

and 94;, so as to make complete rotations of' index shaft- 81 before the uncoupling of the latch 33.

Referring to Figs. 3 to 13, upon the end of the index shaft- 81 is keyed a change wheel 100, which engages with a change wheel 101 directxor at times they are connected by an intermediate gear 102 as shown in Fig. 13, this arrangementis merely a means to reverse the direction of motion. The intermediate gear 102 revolves loosely upona stud 103 secured to a swinging shoe 101, which is arranged to rotate about the index shaft. 81 as a center, and also carries a compound stud 105 upon which are rotatably mounted the gears 101 and 106, the

latter engaging with the gear 107 keyed to the index stud 108. The index stud 108 is connected to the index screw 64 in the -various ways shown in Figs. 8. 10, 11 and 13. Referring partlcularly'to Fig. 8, which vranger-l by the change wheels, 100, 102, 101,

1.06 and 107.

To arrange the machine to index for the equal circular pitches the outer support 114 is removed from the studs 115 and 173 and the equal sized gears 110 and IE1 are re placed by the gears 112 and 113, as shown' in. Fig. 10, whose numbers of teeth are 53 and 37 respectively. Multiplying the linear pitch of the screw, .52359877 by the ratio lf-a constant gearing ratio of .7500073 pitch, or approximately 1- circular "pitch is obtained, which constitutes a tbtal error of .001'168 long in ten feet, and can be neglected 117 having been located as shown in Fig. 12.

The gear 116 engages with one of the compound gears 118, the other compound gear 119 engages with the gear 120 secured to the index screw 161. The numbers of teeth are 43, 61, 64: and 40 respectively, beginning with the gear 116. The constant-ratio be- COIHGS linear pitch, which is equal to 15 m/m pitch; with an error of .00072 inches long in ten feet.

F or module pitches the arrangement is as shown in Fig. 13, in which the stud- 173 is employed to carry the compound gears 122 and 123. The gear 121 secured to the index stud 1 08 engages with the gear 122. and.

the compound gear'123, engages with the gear 124 secured to the index screw 64. The

constant rat-i0 thus obtained is linear pitch or6 module pitch with an error of .000432 inches long in ten feet.

, The arrangement described constitutes a. practical way to overcome the diiticulty of using severa screws. being both rigid and accurate. The device has also the advantage that the same change gears can be used.

for the various diametral and module pitches commonly used. and also the circular and millimeter pitches, buti -dilferently arranged. \Vith ten different c'iange gears, all the pitches commonly used can be obtained in any of the above denominationsf The various movements, such as the feeding and returning of the cutters 5, and the indexing of the work that maybe secured to the table 63, are automatically controlled and interlocked by a series of levers and connecting rods how to be dcscribed ref erence being bad particularly to Figs. 14 to 19 inclusive.

The reversing clutch 36 shown in F 1g. 16

is slidahly keyed to the feed driving shaft 31 and alternately engages the feed worm wheel 32 and the return worm wheel 33 to feed and return the cutters 5 across thework. The clutch 36 is operated by a rock lever 125 engaging a peripheral groove 109 in said clutch 36. The rock lever 125 is secured to a rock shaft 126 which has secured at its .as follows: The cutter ward until it strikes the lower dog 142:

outer end a second lever 127, to which is attached a connecting rod 128 having its other end attached to. a reversing lever 129.

he reversing l'ever 129, is operated by a lost motion lever 130,- both levers 129 and 130 rocking on the same stud 131. Two abutments 132 are provided on the lost motion lever 130, between which the one end of the reversing lever 129 is located and operated and connected to the cutterslide 3 by meansof the trip rod 141, which has one end guided by the stanchion cap 14' (see Fig. 2). Upon the trip rod 141 aremountedtwo adjustable dogs 142, which can be adjusted for the required length of stroke, and are op-' erated by the abutment 143 secured to the cutter slide 3. The functions of the levers thus explained are to automatically feed and return the cutter slide, the operation being slide 3 feeds downthereby forcing the trip rod 141 and the levers 139 and 136 downward, which in turn forces the lost motion lever by means of the rod 135, past the highpointof the incline 134. As soon as the high point of the in cline 134 has been passed, the spring pressed plunger 133 advances down the incline, thus forcing the reversing clutch 36 rapidly away from the feedworm wheel 32,.and into engagement with the return worm wheel 33. The space between the abument 132 and the face of the reversing lever 129 is equal to the distance requiredfor the spring plunger'133 to move across the incline after which the'sprlng operates thelevers 130, 129 127 and 125, whereby the reversing clutch 36 is rapidly withdrawn, causing very little wear upon teeth. The cutter slide then moves upward on its return stroke until it strikes the upper dog, when the mot-ions are reversed, and the slide again advances downward. These motions can also be effected manually by handle 144 on the lever 136. However, be fore the cutter slide again commences to feed, the index is set in motion. This is accomplished by an arm 145, on the opposite end of the lever 130 from the abutments 132.-

said arm 145 having attached thereto ahook 146, which 'draws back when the lost motion plunger 133 is forced downward. thus allowing the hook part 147 to engage with a complementary hook shaped lever 14S, and

the highest point on the clutch the same is forced in place by the spring 149 in the bracket 150 which guides one end of theh-ook 146. lV'hen the slide returns and strikes the upper dog, the hook 146 is pushed forward, and thereby the lever 148, until the incline on the bracket 150 separates the hook 146 from said lever 148. mg been thus rocked, and with it the shaft 151 to which it is secured, and the lever 152 attached to the other end of the rock shaft 151, the index lever secured to the rock shaft 88. lever 86 is secured to the rock shaft 88. 'The latch 83is .thenallowed to be forced into engagement, until the lever 86 is again rocked, by means of the cams, to disengage it, as hereinbefore described.

' During the tral pr inoperative the cutter 'pletion of the indexing, the' arm 155 on the lever 148, which has a lever 148.is rocked bythe hook 146, the arm 156 of the reverse lever .the reverse lever 129'and the reverse clutch 36 central, until the the arm 155,.allows the spring plunger 133 ment with the feed worm wheel. The positions of the levers inFig. 16 are shown at this point, and are being held so, by the stop handle 157 wh' reverse clutch 36 is forced toward the feed side. The end 156 is also arranged so'that when the feed is engaged, the index cannot be started by raising the lever 148 by meansof the handle 176. It can readily be seen that when the reverse lever 129 is in its feed position, the lower end 156is in the path of the arm 155, and does not allow of any downward movement.

scribed controls automatically the feeding and returning of the cutter slide. and the indexing, interlocking each movement until the preceding movement has been completed. A novel arrangement has also been provided whereby the feed can be automatically arrested, and the indexing stopped at any predetermined point; This arrangement is operated by the work table 63, having a T slot 158 provided therein, in which is slidably mounted a double incline 159, arranged to operate a roller 160, and be secured in any The roller 160 is attached to a lever 161, which has a connectingrod 162 attached to its lower side and extending in either dlrec period of'indexing, the revers ing clutch 36 has been maintained in a cen position, thereby holding slide 3 stationary until the comthis is obtained by handle 176 for manual operation. -llvhen the.

upward. movement of l to force the reverse clutch 36 into engage- 10h engages a pin on'the lever 3127. The moment the stop handle 157 is rocked to disengage from the lever 127, the.

The arrangement of levers thus far de-' predetermined position on the work table.

tion. parallel'with the table (33. The one end The lever 148 hav- W .75} 86 1s rocked by .meansfg of the connecting rod 153 and the lever 154';

The indexing 155 is forced into the path of thelower end I 129, thereby holding of the connecting rod 162 is attached to a arm 1680f the bell crank lever 166 in the path of the lost motion lever 130 to arrest the feed until it is again disconnected by- The rocking of the lever 161 the. operator.

(is accomplished by the double incline 159 .dex

mbination operating in either direction of the table 63. The other end of the rod 162 is attached to a rock lever 169 secured to a vertical rock shaftl'TO, upon the lower end of which is secured,.thc clutch lever 171 operating the clutch 72, whereby the indexing mechanism is instantly disengaged at any predetermined pointon the table 63.

Having described my invention, I claim as new and desire to secure by Letters Patent, the following:

1. Thecombinat-ion with a cutter carriage, of a work supporting table, of a screw, with a fixed lead, to index same, an index shaft, means controlled by said cutter carriage to intermittently rotate said index shaft at desired intervals, a stud, gearing connecting said screwand stud to change the fixed lead of said screw to an integral or fractional unit in any of the common systems of gear tooth measurements inpractice, and change gears connecting said inshaft and stud to vary the number of units indexed by said screw in any of the systems. i with a cutter carriage, of a work supporting table, of a screw with a diamctral pitch lead to index same, and index shaft, means controlled by said cutter carriage to intermittently rotate said index shaft at desiredi intervals, a stud, gearing connecting said screw and stud to change the lead ofsaid screw to an integral 0r fractional circular pitch unit of measure and change gears connecting said index shaft and stud to index said work table fractional or multiple parts of said unit of measure.

3. The combination with a cutter carriage,

. of a work supporting table, of a screw with a diametral pitch lead to index same, and index shaft, means controlled 'by said cutter carriage to intermittently rotate said index shaft at desired intervals, a stud, a second stud, gearing connecting said screw and studs to change the lead of said screw to an integral or fractional metric pitch unit of measure, and change gears connecting said index shaft and said first stud, to index said work table fractional or multiple parts of said unit of measure.

4. The combination with a cutter carriage, of a work supporting table, of a screw with a diametral pitch lead to index same, an

index shaft,.means controlled by said cutter carriage to intermittently rotate said index shaft at desired intervals, a stud, a' second stud, gearing connecting said screw and studs to change the lead of said screw to an integral or fractional module pitch unit of measure, and change gears connecting said first stud and index shaft to index said work I able fractional or multipl parts of said imit of measure.

The combination with a work supporting table, of a reciprocating cutter carriage, indexing mechanism operating said table at desired intervals, and means operated by said work table to disconnect said index mechanism at any predetermined point.

6. 'lfhe combination with a work support ing table, of a reciprocating cutter carriage, indexing mechanism for said table, means controlled by said cutter carriage to set said indexing mechanism in operation at desired intervals, and means controlled by said table to disconnect said indexing mechanism at any predetermined point.

7. The combination, with a Work support; ing table, of a reciprocating cutter carriage, an indexing mechanism for said table, comprising an indexing disk, a constantly rotating driving shaft, means to couple and uncouple said disk with said driving shaft controlled by said cutter carriage, and means controlled by said table to disconnect said driving shaft from its source of .power whereby the indexing is discontinued at any predetermined point.

an indexing mechanism for said table, comprising an indexing disk, a constantly rotating driving shaft, a clutch connecting said driving shaft to its source of power, means to couple and uncotiple said disk with said driving shaft controlled by said cutter carriage, and means controlled by said table, operating said clutch to disconnect said shaft-from its source of power, whereby the indexing is discontinued at any predetermined point.

' 9. The combination with a work supporting table, of indexing mechanism therefor, ,a cutter carriage, feeding and retracting piechanism therefor, comprising two oppositely rotating driving members, a clutch, means to alternately connect said clutch with said driving-member to feed and retract said carriage and means to index said work table when said carriage is retracted with means .to hold said carriage stationary during said indexing, and means controlled by said table to disconnect said indexing mechanism at any predetermined time.

10. The combination with a work supporting table, of indexing mechanism therefor, a cutter carriage, feeding and retracting mechanism therefor, means to index said 8. The combination with a work support-- ing table, of a reciprocating cutter carriage sition, whereby the machine becomes subfor, a cutter carriage, feeding and retracting mechanism therefor, means to ndex said table when said carr age 1s retracted w th.

stantially inoperative.

11. The combination with a Work supporting table ofindexing inechanism theremeans controlled by said table to disconnect said indexing at any predetermined point. 12. The combination with a Work supporting table, of an indexing mechanism therefor, a cutter carriage, feeding and retracting mechanism therefor, a reverslng clutch controlled by said cutter carriage to alternately connect said feeding and retracting mecha nism to sand cutter carriage, means con-- trolled by said work table to maintain said reversing clutch in a neutral or inoperative position and-t0 disconnect said indexing" mechanism at any predetermined point Thev combination with a cutter carriage, of a feeding andretracting mechanism therefor a spring pressed reversing lever connected to and operated by said cutter carriage to alternately connect said feeding and retracting meehanisni to said cutter carriage, a" stop therefor, a work support, an lndex'shaft connected therewith, an indexing clutch, an indexing lever to couple and uncouple said clutch and index.

shaft, connections between said reversing and indexing levers t0 vcouple said clutch and index. shaft when cutter carriage is retracted, other connections between said indexing lever and stop, for said reversing lever to maintain said carnage 1n- 'a retracted positionduring the indexing movement, 4 and means to disconnect saidindexing Inechanisrn controlled by said work support. WILLIAM F. ZIMMERMANN.

Witnesses:-'

BENJAMn I' NITTINGER, 'Enwr'rg :C. :THURSTON.

Copiesof thls patent may be obtained for five cents eaeh, 'bi'addressing the Commissioner of Patents.

Washington, D. O. V 

